Unigas HTP512A, Installation, User'S, And Maintenance Manual

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C.I.B. UNIGAS - M039219CA
34
5 record the high flame value set during the gas operation adjustments (see previous paragraphs);
6 start the burner up by means of the thermostat series and wait until the pre-purge time comes to an end and that the bruner starts
up;
7 drive the burner to high flame stage, by means fo the thermostat TAB .
8 Then move progressively the microswitch to higher values until it reaches the high flame position; always check the combustion
values and eventually adjusting the oil pressure (see next step).
9 the nozzle suplly pressureis already factory-set and must not be changed. Only if necessary, adjust the supply pressure as follows
(see related paragraph);insert a pressure gauge into the port shown on Fig. 32 and act on on the pump adjusting screw
VR (see
Fig. 31 and page 20) as to get the nozzle pressure at 20 bar or 25bar (according to the nozzle model provided: Bergonzo or Flui-
dics nozzles - see page 32-33).
10 in order to get the maximum oil flow rate, adjust the pressure (reading its value on the PG pressure gauge) without changing the air flow
rate set during the gas operation adjustments (see previous paragraph): checking always the combustion parameters, the adjustment is to
be performed by means of the
SV2 adjusting cam screw (see picture) when the cam has reached the high flame position.
11 as for the point-to-point regulation in order to set the cam foil shape, move the oil low flame microswitch (cam V) a little lower than
the maximum position (90°);
12 set the TAB thermostat to the minimum in order that the actuator moves progressively towards the low flame position;
13 move cam V(low flame) towards the minimum to move the actuator towards the low flame until the two bearings find the adjusting
screw that refers to a lower position: screw V2 to increase the rate, unscrew to decrease, in order to get the pressure as showed
on chart/diagram on “Adjusting light oil flow rate” on page 32, according to the requested rate.
14 Move again cam V towards the minimum to meet the next screw on the adjusting cam and repeat the previous step; go on this way
as to reach the desired low flame point.
15 The low flame position must never match the ignition position that is why cam V must be set 20°- 30° more than the ignition posi-
tion.
Turn the burner off; then start it up again. If the adjustment is not correct, repeat the previous steps.
Adjustment by the Siemens SQL33.. actuator
1 Once the air and gas flow rates are adjusted, turn the burner off, switch the CM switch to the heavy oil operation (OIL, on the bur-
ner control panel (see page 37).
2 with the electrical panel open, prime the oil pump acting directly on the related CP contactor (see next picture): check the pump
motor rotation and keep pressing for some seconds until the oil circuit is charged;
3 bleed the air from the M pressure gauge port (Fig. 31) by loosing the cap without removing it, then release the contactor.
4 record the high flame value set during the gas operation adjustments (see prevoius paragraphs);
5 Start the burner up by means of the thermostat series and wait unitl the pre-purge phase comes to end and that burner starts up;
6 the burner starts up with the actuator on the ignition position, set it to the MAN (manual mode), by the MAN/AUTO selector (ignition
position= read on the air damper index ID1 );
7 disconnect the TAB thermostat removing the wire from the terminal no. 6 or by setting MAN on the RWF40 modulatore or by set-
ting 0 by means of the CMF switch (only for fully-modulating burners);
STM30.. actuator cams
I High flame
II Stand-by and Ignition
III Low flame (gas)
V Low flame (oil)
Fig. 32 Fig. 33
MAN-AUTO
Pressure gauge port
RP
PG
V2
SV2
CP